Small Clone - Reduction of treble and increase of mids, bass and volume

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I built Small Clone, based on the Guitar FX Layouts website and made some changes.
1 - I placed a dpdt switch connected to the 150p capacitor point, with 100p in the center position, 47p to the left, totaling 150p and 220p to the right, totaling 320p. Great results here.

Mix Control: I used a 20K potentiometer and a 12K resistor in series on terminal 1 and another on 3. In the central position I should have approximately 20K and 22K for each side and turning CCW or CW, I have dry or vibrato, but not 100% , probably because there is a fixed value of resistance. Not ideal, but acceptable solution.

I have other problems that I still haven't been able to solve: The pedal sound has a lot of highs and brightness, and I miss the mids and bass. Maybe that's why I have the impression that it sounds a little less at volume than off.

What I need:
Reduce the treble;
Increase mids and bass
Slightly increase the volume to balance with the pedal sound off

suggestions?